From: "Toke Høiland-Jørgensen" <toke@kernel.org>
To: Paolo Abeni <pabeni@redhat.com>, netdev@vger.kernel.org
Cc: Heng Qi <henqqi@linux.alibaba.com>,
Xuan Zhuo <xuanzhuo@linux.alibaba.com>,
bpf@vger.kernel.org
Subject: Re: [PATCH net-next 0/2] veth: a couple of fixes
Date: Fri, 18 Nov 2022 12:05:39 +0100 [thread overview]
Message-ID: <87pmdky130.fsf@toke.dk> (raw)
In-Reply-To: <edc73e5d5cdb06460aea9931a6c644daa409da48.camel@redhat.com>
Paolo Abeni <pabeni@redhat.com> writes:
> On Fri, 2022-11-18 at 00:33 +0100, Paolo Abeni wrote:
>> Recent changes in the veth driver caused a few regressions
>> this series addresses a couple of them, causing oops.
>>
>> Paolo Abeni (2):
>> veth: fix uninitialized napi disable
>> veth: fix double napi enable
>>
>> drivers/net/veth.c | 6 ++++--
>> 1 file changed, 4 insertions(+), 2 deletions(-)
>
> @Xuan Zhuo: another option would be reverting 2e0de6366ac1 ("veth:
> Avoid drop packets when xdp_redirect performs") and its follow-up
> 5e5dc33d5dac ("bpf: veth driver panics when xdp prog attached before
> veth_open").
>
> That option would be possibly safer, because I feel there are other
> issues with 2e0de6366ac1, and would offer the opportunity to refactor
> its logic a bit: the napi enable/disable condition is quite complex and
> not used consistently mixing and alternating the gro/xdp/peer xdp check
> with the napi ptr dereference.
>
> Ideally it would be better to have an helper alike
> napi_should_be_enabled(), use it everywhere, and pair the new code with
> some selftests, extending the existing ones.
>
> WDYT?
FWIW, the original commit 2e0de6366ac1 was merged very quickly without
much review; so I'm not terribly surprised it breaks. I would personally
be OK with just reverting it...
-Toke
next prev parent reply other threads:[~2022-11-18 11:06 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-11-17 23:33 [PATCH net-next 0/2] veth: a couple of fixes Paolo Abeni
2022-11-17 23:33 ` [PATCH net-next 1/2] veth: fix uninitialized napi disable Paolo Abeni
2022-11-17 23:33 ` [PATCH net-next 2/2] veth: fix double napi enable Paolo Abeni
2022-11-18 14:24 ` Heng Qi
2022-11-18 8:41 ` [PATCH net-next 0/2] veth: a couple of fixes Paolo Abeni
2022-11-18 11:05 ` Toke Høiland-Jørgensen [this message]
2022-11-19 1:06 ` Jakub Kicinski
2022-11-21 6:15 ` John Fastabend
2022-11-21 3:33 ` Xuan Zhuo
2022-11-21 3:55 ` Heng Qi
2022-11-21 10:11 ` Paolo Abeni
2022-11-21 11:28 ` [PATCH 0/2] Revert "veth: Avoid drop packets when xdp_redirect performs" and its fix Heng Qi
2022-11-21 11:28 ` [PATCH 1/2] Revert "bpf: veth driver panics when xdp prog attached before veth_open" Heng Qi
2022-11-21 11:28 ` [PATCH 2/2] Revert "veth: Avoid drop packets when xdp_redirect performs" Heng Qi
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